Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
  • H04L65/1066—Session management
  • H04L65/1069—Session establishment or de-establishment
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
  • H04L65/1066—Session management
  • H04L65/1073—Registration or de-registration
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
  • H04L65/1066—Session management
  • H04L65/1083—In-session procedures
  • H04L65/1095—Inter-network session transfer or sharing
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
  • H04L65/10—Architectures or entities
  • H04L65/1016—IP multimedia subsystem [IMS]

Definitions

• the present invention relates to the field of 3 G mobile communication, especially to a registration request which is not initiated by a subscriber in an Internet Multimedia Sub-system.
• IMS Internet Multimedia Sub-system
• S-CSCF Service Call Session Control Function
• PUI Public User Identification
• IP address IP address
• a Proxy Call Session Control Function (hereinafter referred to as P-CSCF) 102 serves as a proxy gateway for IMS accessing, which usually is a certain gateway of the network in which the subscriber currently locates.
• the address of the gateway is detected by the P-CSCF 102 and informed by the network when the subscriber is performing IP access.
• criterion TS23.228 For more information to implement the operation, please refer to criterion TS23.228.
• the P-CSCF 102 By parsing a home network name included in the PUI of the subscriber 101, the P-CSCF 102 finds out an Inquiry Call Session Control Function (I-CSCF) 103, through which the P-CSCF 102 can interact with a Home network registration Subscriber Server (hereinafter referred to as HSS) 105 to find out the S-CSCF 104 that the subscriber 101 belongs to.
• HSS Home network registration Subscriber Server
• the I-CSCF 103 finds out the subscriber's S-CSCF 104, it forwards messages received from the P-CSCF 102 to the S-CSCF 104 to process them. If the S-CSCF 104 hasn't saved the subscriber's service attribute yet, it requests this information from the HSS 105.
• FIG. 9 shows a process of registration state inquiry.
• the I-CSCF receives an INVITE message, which is used to establish a first Session Initiation Protocol (hereinafter referred to as SIP) message initiated by an IMS call.
• SIP Session Initiation Protocol
• the INVITE message includes the subscriber's SIP URI or TEL URI. Regardless which subscriber's PUI is included in this message, the I-CSCF is able to find out the subscriber's HSS according to available criteria.
• HSS information on some service characteristics and the like agreed between the subscriber and the operator is included.
• the information on whether the subscriber has registered with the IMS or not is included in the HSS.
• the I-CSCF sends a Cx-LocQuery message to the HSS, including the subscriber's information on PUI and so on.
• the HSS returns the information on whether the subscriber has been registered or not, which is included in Cx-LocQueryResp message, If yes, it returns the selected S-CSCF information to the HSS.
• the I-CSCF selects a certain S-CSCF according to the characteristics of S-CSCF in step 804.
• the I-CSCF sends the received INVITE message to the S-CSCF.
• the S-CSCF If the S-CSCF has no idea of the subscriber's service attributes, it requests this information from the HSS. In step 806, the S-CSCF sends a Cx-PuIl message to the HSS, including the UE's PUI and so on. In step 807, the HSS returns the subscriber's service attributes to the S-CSCF. According to the subscriber's service attributes information obtained in the previous step, the S-CSCF conducts service control in step 808 and then performs corresponding service operation in step 809.
• CSI Combinatorial Circuit Switching domain Call and IMS Session
• CS domain Switching domain
• the UEs access a CS domain core of the CS domain and an IMS domain core of the IMS domain through Access network corresponding to each of the UE.
• the CS domain core refers to the network entity related to the CS domain call. In general, it may include the Mobile terminal Switching Center (hereinafter referred to as MSC), Visit Location Register (hereinafter referred to as VLR), etc..
• MSC Mobile terminal Switching Center
• VLR Visit Location Register
• the IMS domain core refers to the network entity related to the IMS domain session. In general, it may include all entities in figure 1. Before conducting CSI service between two UEs, they must be in advance informed of their abilities in CSI supporting. The ability in CSI supporting is transferred via an OPTIONS message.
• Figure 2 illustrates the process of transferring a terminal's CSI supporting ability between two subscribers through the OPTIONS message, which may include parameters such as UE A's MS-ISDN, SIP URI, the type of media bearer, whether the CSI is supported or not, and so on.
• UE A sends the OPTIONS message to UE B.
• the UE A is the mobile terminal currently used by the calling subscriber to initiate the call to the called subscriber; while UE B is the mobile terminal currently used by the called subscriber to receive the call from the calling subscriber.
• 3GPP TS 23.279 please refer to criterion 3GPP TS 23.279.
• the UE B sends the 200 OK message to the UE A, which includes the UE B's MS-ISDN, SIP URI, the type of media bearer, whether the CSI is supported or not, and so on.
• the UE A knows about UE B's terminal ability, and vice versa.
• UE B updates UE A's ability that is saved in UE B's memory
• UE A updates UE B's ability this is saved in UE A's memory.
• the terminal ability of the counterpart is saved in the terminal of the UE and is monitored and controlled by a certain timer. If timeout happens to the timer, it begins to exchange a new process of terminal ability. In addition the terminal ability of the counterpart saved in the flash memory will be overwritten by a new one.
• the Circuit Switching domain call is initiated by the UE A between the UE A and the UE B.
• a CS domain call is conventionally established between a subscriber A and a subscriber B, and the communication is performed.
• the process of terminal ability exchanging is performed between the subscriber A and the subscriber B.
• all steps in figure 2 are summed up.
• the OPTIONS message is sent by the subscriber A to its S-CSCF, the message may include the information on the UE B's TEL URI as well as the subscriber A's terminal ability information.
• the subscriber that has not registered with the IMS is detected, i.e., the IMS core B has no idea of the subscriber's current IP address. Therefore no communication can be done between the UE A and the UE B.
• the IMS core B detects that the subscriber has not registered with the IMS when the IMS session is being established in steps 303 ⁇ 314, i.e., the IMS core B has no idea of the subscriber's current IP address, no communication can be done between the UE a and the UE B either.
• an object of the present invention is to provide a method for requesting an unregistered UE to perform registration in the IMS.
• This method is used for the data service transmission enhancement.
• a calling UE A sends a CS message to a called UE B to inform it of conducting IMS registration.
• a CSI service can be guaranteed between the calling and the called subscribers.
• a method for requesting an unregistered UE to perform registration in an IMS comprising steps of: a) initiating an IMS domain session or sending an IMS relevant signaling to a called subscriber by a UE A; b) informing the UE A information that the called subscriber has not registered with the IMS by the network; c) requesting the called terminal to conduct IMS registration by the UE A; and d) restarting the IMS session after the called terminal completes the IMS registration.
• an IMS unregistered UE can also perform the IMS service.
• a method requesting an unregistered UE to perform registration in an IMS comprising steps of: a) initiating a CS domain call by a UE A to a called subscriber to request the called subscriber to conduct an IMS registration or inform the called subscriber of the UE A's inclination of the IMS registration; b) informing the UE A by the called user of the called user' inclination of the IMS registration in a response message; c) determining by the UE A or the called user whether to perform an IMS session and a process of terminal ability switching or not according to the inclinations of its own and that of a counterpart.
• Figure 1 shows a block diagram of architecture of an IMS
• Figure 2 illustrates a process that a UE exchanges terminal ability in virtue of an OPTIONS message
• Figure 3 shows that an IMS session is added between two UEs based in a CS domain call
• Figure 4 shows a structure according to the present invention
• Figure 5 illustrates a process of initiating an IMS registration request with a call control message when "OPTIONS" is being transferred
• Figure 6 illustrates a process of initiating an IMS registration request with a call control message when "INVITE" is being transferred
• Figure 7 illustrates a process of initiating an IMS registration request with a call control message when the call is being established
• Figure 8 shows a block diagram of CSI architecture
• Figure 9 illustrates a process of detecting IMS registration state
• Figure 10 illustrates the operation of the UE according to a third embodiment.
• FIG. 4 shows a structure according to the present invention.
• a calling subscriber initiates an IMS domain session or sends an IMS domain session.
• IMS relevant signaling to a UE B owned by a called subscriber. If the network detects that the called subscriber has not been registered to the IMS, it informs this information to the UE A in step 402 and then the UE A sends an IMS registration request to the called subscriber's UE B in step 403.
• the UE B negotiates with the called subscriber and if the called subscriber determines to conduct the IMS registration, the UE B performs the process of IMS registration in step 405.
• the UE B informs the UE A of the information on IMS registration state and this step is optional in the present invention.
• the UE A or an IMS core B restarts a new session or goes on the original call.
• Figure 5 shows one embodiment of the present invention.
• the UE A After a CS domain call is established between the UE A and the UE B, it is necessary for the UE A to exchange the terminal ability with the UE B and in step 501, the UE A sends an OPTIONS message to its IMS core A, including parameters such as the UE B's SIP URI, the UE A's MSISDN, SIP URI, the type of media bearer, whether the CSI is supported or not, and so on.
• parameters such as the UE B's SIP URI, the UE A's MSISDN, SIP URI, the type of media bearer, whether the CSI is supported or not, and so on.
• the UE A's IMS core A After the UE A's IMS core A receives and processes this message, it finds out the UE B's IMS core entity which will be an Inquiry CSCF (hereinafter referred to as I-CSCF) in general according to the IMS's routing addressing mode, sends the OPTIONS message to the UE B's IMS core so as to change a routing address in the original message while keeping UE A's terminal ability unchanged in step 502.
• I-CSCF Inquiry CSCF
• the IMS core B finds out that this UE does not conduct the IMS registration, it returns an undetected message 404 to the UE in step 504.
• This message is routed from the IMS cores A to the UE A in step 505.
• the UE A After the UE A receives this message and finds out that the UE B has not registered, it initiates a request to ask the UE B to perform IMS registration.
• the UE A sends a call control message "USER INFORMATION" to a CS core entity (usually the MSC).
• This message can either be an old call control message, or a new one.
• a "USER INFORMATION" message including an IMS registration request information element and other information regulated by available criteria is used.
• the CS core A translates the "USER INFORMATION" message to USR (User-to-User Information) and sends it to the UE B's CS core.
• the UE B's CS core forwards this message to the UE B and after the UE B receives this message, it finds out the IMS registration request information is included in this message.
• the UE B if the UE B permits its subscriber to perform IMS registration process, the registration will be carried out between the UE B and the UE B's IMS core entity.
• 3GPP TS 24.228 For detailed description on this process, please refer to 3GPP TS 24.228.
• the UE B After the UE B succeeds in its IMS registration, the UE B either initiates the "OPTIONS" message to exchange terminal ability with the UE A or informs UE A of its IMS registration state.
• the UE B sends the "OPTIONS" message to IMS core B and the "OPTIONS” message is forwarded by the UE B's IMS core B and the UE A's IMS core A in step 514 and finally reaches the UE A in step 513.
• the UE A may include its terminal ability in a "200 OK" message (which is an acknowledgement message to the "OPTIONS") in step 518, the message is forwarded by the UE A's IMS core A and UE B's IMS core B and finally reaches UE B in steps 517 and 516, and thus the process of terminal ability exchanging has completed.
• the UE B sends the "USER INFORMATION" message to the CS core B in step 510, which in turn forwards this message to the CS core A in virtue of the USR (USER-to-USER INFORMATION) message (step 511).
• the CS core A forwards the "USER INFORMATION” message to the UE A (step 512).
• This message may include the UE B's IMS registration state information: whether the registration succeeds or fails.
• Figure 6 describes another embodiment of the present invention.
• a CS domain call has already been established between the UE A and the UE B.
• the UE B's terminal ability has been well saved in the UE A. Therefore, once the UE A wants to have an addition of new IMS session, it sends an "INVITE" message to the IMS core A (step 601), which in turn forwards this message to the IMS core B after processes such as routing addressing and so on is performed (step 602).
• the IMS core B may check whether the UE B has performed any IMS registration or not (step 603). In this example, it is assumed that the UE B has not registered with IMS.
• the IMS core B sends a message(404 no detection message) that no IMS registration has been detected to the IMS core B in step 604.
• This message also includes a time length of a timer. The timer indicates that once timeout happens, the UE A will re-initiates the IMS call, i.e., the "INVITE" message shown in step 610 in figure 6. If no timer is included in the message, no IMS call will be initiated by the UE A to the network and the rest part of the call process will be done by the network.
• the UE A may request the UE B to carry out the operation of IMS registration, and send the "USER INFORMATION" message to the CS core A (step 606), including the information element of IMS registration request.
• the CS core A encapsulates this message in the form of USR message and sends it to the CS core B (step 607) and the USR message also includes the information element of IMS registration request.
• the CS core B re-encapsulates the content of this message and sends it in the form of the USER INFORMATION message to the UE B (step 608). This message may include the information element of IMS registration request.
• the UE B After the UE B receives this "USER INFORMATION" message, and finds out that the calling subscriber requests UE B to register with the IMS and the UE B negotiates with its subscriber. If the subscriber permits it to conduct IMS registration, the IMS registration will be carried out between the UE B and the IMS core B (step 609). This registration process is not the essential of the present invention and 3GPP TS 24.228 will be referred to for details.
• step 610 After the IMS core B finds out that the UE B has succeeded in its registration, if no timer (steps 604 and 605) is included in the message (which is sent from the IMS core B to the UE A 404) that no IMS registration has been detected, it is necessary for the IMS core B to send the "INVITE" message to the UE B (step 612) and to continue the process of establishing the IMS session initiated by the UE A. In step 610, otherwise, the UE A sends the "INVITE" message to the IMS core B again once timeout happens to the UE A. After the IMS core B receives this "INVITE" message (step 611), it forwards it to the UE B (step 612) to carry out the calling process.
• the UE B accepts this call by feeding back the "200 OK" message (from steps 613 to 615). After the UE A receives the feedback "200 OK" message, it sends ACK to UE B (from steps 616 to 618). Thus, the process of establishing the IMS session completes. In this example, if the UE B does not want to perform the IMS registration, when the UE A initiates another call (steps 610 and 611), the UE A no longer requests an establishment of the IMS session even if the timer is not included in the received 404 message that no IMS registration has been detected (steps 619 and 620).
• FIG. 7 describes a third embodiment of the present invention. Actually, two cases are included in this embodiment.
• a "SETUP" message sent from the UE A to the UE As CS core may include IMS registration request (step 701).
• the UE A sending this IMS registration request means that the UE A has performed the IMS registration. Otherwise, no IMS registration request is included in the "SETUP" message. This message is forwarded to the UE B through the UE A's CS core and the UE B's CS core.
• a message transferred by the UE A's CS core and the UE B's core CS is named as IAM.
• the UE B After the UE B receives the IMS registration request, it negotiates with its subscriber whether to perform IMS registration or not (step 703). If necessary, the information that the UE B should perform IMS registration is indicated by an identifier included in the returned IMS state of a "CONNECT" message (step 702).
• the "CONNECT" message may also be an "ALERTING" one.
• the IMS registration state indicates nothing but that the UE B is willing to perform the IMS registration.
• This information is transferred to the UE A's CS domain network by a message ANM or ACM between networks, and finally to the UE A by "ALTERTING" or "CONNECT".
• the UE A After the UE A receives the IMS state, it will reference to this information in its subsequent IMS calls or processes of terminal ability switching.
• the UE B Because the UE B has received the IMS registration request, it is aware that the UE A has been in the state of IMS registration. This information can be the reference for subsequent IMS call or the process of terminal ability switching. Only when the IMS registration processes have been performed by oneself and its counterpart, the IMS call or the process of terminal ability switching may be carried out (step 704) (as shown in figure 6 and figure 5).
• the UE A may check the UE B's IMS registration state after communicating with the UE B, or after it receives 404 message that no IMS registration has been detected, as shown in step 604 in figure 6 or in step 504 in figure 5. No matter which case is related to, the applied messages are just the same.
• the UE A sends the "USER INFORMATION" message to the CS core A to check its IMS registration state (step 701).
• the CS core A translates it into the USR (User-to-User Information) and sends it to the UE B's CS core.
• the CS core B translates the USR into the USER INFORMATION and sends it to the UE B.
• the UE B sends the IMS state to the UE A also in virtue of the USER INFORMATION.
• the parameter included in the CS message is allowed to be a non-IMS registration request and by the CS message that the UE A sends to the UE B to request it to perform the IMS registration, the UE A may inform the UE B of its inclination of the IMS registration.
• the CS message sent to the UE B may contain the UE A's state information on IMS registration, which indicates that the UE A has performed the IMS registration or is going to perform IMS registration. If the UE A does not want to perform the IMS registration, the state information on IMS registration included in the CS message indicates that the UE A would not perform the process of IMS registration. If the UE A is going to perform the process of IMS registration, this process may be done within a finite time period right after the message is transmitted or may be done before that the message is transmitted.
• the UE B After the UE B receives the state information on IMS registration included in the message, it saves this information and sends back a response message, such as the "ALTERTING" or "CONNECT” message, informing the UE A of UE B's inclination of IMS registration.
• This information indicates that the UE B has performed the IMS registration or is going to perform the IMS registration, or would not conduct the process of IMS registration. If the UE B is going to conduct the process of IMS registration, this process may be done within a finite time period right after the message is transmitted or may be done before that the message is transmitted.
• the IMS call or the process of terminal ability switching can be carried out (as shown in figure 6 and figure 5). If either of the two sides does not want to perform IMS registration, neither of them can initiate the IMS call or conduct the process of terminal ability switching.
• the parameter that can take this information may be the information element User-User in these messages.
• the User-User protocol identifier in the User-User information element may be the state of IMS registration with "0" indicating that having the inclination of IMS registration, while "1" indicating that having no inclination of
• Figure 10 illustrates the operation of UE in the third embodiment based on figure 7.
• step 1001 it is determined whether this operation is performed by the calling subscriber or by the called subscriber. If by the calling subscriber, in step 1002, it is checked that if this user has been registered or it is willing to conduct the IMS registration. If yes, in step 1003, the message send by the calling to the called includes the registration request information element or the inclination of IMS registration is set as "Yes”. Otherwise, in step 1004, the message send by the calling to the called contains no registration request information element or the inclination of IMS registration is set as "No". In step 1001, it is determined whether this operation is performed by the calling subscriber or by the called subscriber. If by the calling subscriber, in step 1002, it is checked that if this user has been registered or it is willing to conduct the IMS registration. If yes, in step 1003, the message send by the calling to the called includes the registration request information element or the inclination of IMS registration is set as "Yes". Otherwise, in step 1004, the message send by the calling to the called contains no registration request information element or the inclination of IMS registration is
• step 1005 after the calling receives the message sent from the called, it saves the counterpart UE's inclination of IMS registration according to the information included in the message. If this is the operation performed by the called, in step
• step 1006 whether the received message contain information element of the IMS registration request or not is checked. If yes, in step 1007, the counterpart UE's inclination of IMS registration is saved as "Yes”. If the message contains no information element of IMS registration request or inclination, the counterpart UE's inclination of IMS registration is saved as "No”. In step 1008, if the message contains the information element of IMS registration inclination, the counterpart UE's inclination of IMS registration is saved as "Yes”. In step 1009, the called UE sends a message to the calling UE to inform it whether the called UE's IMS registration inclination is set as "Yes” or "No".
• step 1011 No matter which side initiates the process of IMS session establishment or the process of terminal ability switching, it is necessary to judge whether both sides have the inclination of IMS registration or not in step 1010. If yes, in step 1011, the subsequent process of IMS session establishment or the process of terminal ability switching may be carried out; otherwise, in step 1012, neither the subsequent process of IMS session establishment nor the process of terminal ability switching can be carried out.

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• General Business, Economics & Management (AREA)
• Multimedia (AREA)
• Computer Networks & Wireless Communication (AREA)
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• Mobile Radio Communication Systems (AREA)

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• 2006
  • 2006-05-02 US US11/913,155 patent/US8036659B2/en active Active
  • 2006-05-02 WO PCT/KR2006/001652 patent/WO2006118416A1/en active Application Filing
  • 2006-05-02 EP EP12167415.4A patent/EP2487840B1/de active Active
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